Restoration of testis function in hypogonadotropic hypogonadal mice harboring a misfolded GnRHR mutant by pharmacoperone drug therapy

Jo Ann Janovick, M. David Stewart, Darla Jacob, L. D. Martin, Jian Min Deng, C. Allison Stewart, Ying Wang, Anda Cornea, Lakshmi Chavali, Suhujey Lopez, Shoukhrat Mitalipov, Eunju Kang, Hyo Sang Lee, Pulak R. Manna, Douglas M. Stocco, Richard R. Behringer, P. Michael Conn

    Research output: Contribution to journalArticle

    46 Scopus citations

    Abstract

    Mutations in receptors, ion channels, and enzymes are frequently recognized by the cellular quality control system as misfolded and retained in the endoplasmic reticulum (ER) or otherwise misrouted. Retention results in loss of function at the normal site of biological activity and disease. Pharmacoperones are target-specific small molecules that diffuse into cells and serve as folding templates that enable mutant proteins to pass the criteria of the quality control system and route to their physiologic site of action. Pharmacoperones of the gonadotropin releasing hormone receptor (GnRHR) have efficacy in cell culture systems, and their cellular and biochemical mechanisms of action are known. Here, we show the efficacy of a pharmacoperone drug in a small animal model, a knock-in mouse, expressing a mutant GnRHR. This recessive mutation (GnRHR E90K) causes hypogonadotropic hypogonadism (failed puberty associated with low or apulsatile luteinizing hormone) in both humans and in the mouse model described. We find that pulsatile pharmacoperone therapy restores E90K from ER retention to the plasma membrane, concurrently with responsiveness to the endogenous natural ligand, gonadotropin releasing hormone, and an agonist that is specific for the mutant. Spermatogenesis, proteins associated with steroid transport and steroidogenesis, and androgen levels were restored in mutant male mice following pharmacoperone therapy. These results show the efficacy of pharmacoperone therapy in vivo by using physiological, molecular, genetic, endocrine and biochemical markers and optimization of pulsatile administration. We expect that this newly appreciated approach of protein rescue will benefit other disorders sharing pathologies based on misrouting of misfolded protein mutants.

    Original languageEnglish (US)
    Pages (from-to)21030-21035
    Number of pages6
    JournalProceedings of the National Academy of Sciences of the United States of America
    Volume110
    Issue number52
    DOIs
    StatePublished - Dec 24 2013

    Keywords

    • Intracellular trafficking
    • Protein misrouting
    • Protein trafficking

    ASJC Scopus subject areas

    • General

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